I like all the various forms but they need to use better judgement in how each is applied.
for short characters( think 4.5' and shorter) a piece should be made something like the stump leg piece for the black panther zombie fig but with the front "toe" piece molded on like a standard MM foot.
average size characters( 4.5' to say 6.5'or 7') work well with a standard 2" body, and bulkier characters like the thing should utilize some sort of powerhouse chest piece.
i like taller/ bigger characters to use the 2.5 body, the problem is the head on the 2.5 is really sculpted to large as is, and this body should only be used to sparingly, Hulk yes, giant man sure, Bane hell no.
next throw in the 3" body for super size characters like Apocalypse, the Watcher, Galactus yeah its not even close to scale but it would be cool to see these evey once in a while.